name: Update SPDX license data
on:
  push:
    paths:
      - .github/workflows/spdx.yml
    branches-ignore:
      - master
  schedule:
    - cron: "0 0 * * *"
  workflow_dispatch:

permissions:
  contents: read

jobs:
  spdx:
    if: github.repository == 'Homebrew/brew'
    runs-on: ubuntu-22.04
    steps:
      - name: Set up Homebrew
        id: set-up-homebrew
        uses: Homebrew/actions/setup-homebrew@master
        with:
          core: false
          cask: false
          test-bot: false

      - name: Configure Git user
        uses: Homebrew/actions/git-user-config@master
        with:
          username: BrewTestBot

      - name: Set up commit signing
        uses: Homebrew/actions/setup-commit-signing@master
        with:
          signing_key: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY }}

      - name: Update SPDX license data
        id: update
        env:
          GITHUB_TOKEN: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
        working-directory: ${{ steps.set-up-homebrew.outputs.repository-path }}
        run: |
          git fetch origin

          BRANCH="spdx-update"
          echo "branch=${BRANCH}" >> "$GITHUB_OUTPUT"

          if git ls-remote --exit-code --heads origin "${BRANCH}"
          then
            git checkout "${BRANCH}"
            git checkout "Library/Homebrew/data/spdx"
          else
            git checkout --no-track -B "${BRANCH}" origin/master
          fi

          if brew update-license-data
          then
            git add "Library/Homebrew/data/spdx"
            git commit -m "spdx: update license data." -m "Autogenerated by [a scheduled GitHub Action](https://github.com/Homebrew/brew/blob/master/.github/workflows/spdx.yml)."
            echo "committed=true" >> "$GITHUB_OUTPUT"
            PULL_REQUEST_STATE="$(gh pr view --json=state | jq -r ".state")"
            if [[ "${PULL_REQUEST_STATE}" != "OPEN" ]]
            then
              echo "pull_request=true" >> "$GITHUB_OUTPUT"
            fi
          fi

      - name: Push commits
        if: steps.update.outputs.committed == 'true'
        uses: Homebrew/actions/git-try-push@master
        with:
          token: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
          directory: ${{ steps.set-up-homebrew.outputs.repository-path }}
          branch: ${{ steps.update.outputs.branch }}
          force: true
          origin_branch: "master"

      - name: Open a pull request
        if: steps.update.outputs.pull_request == 'true'
        run: gh pr create --fill
        env:
          GITHUB_TOKEN: ${{ secrets.HOMEBREW_GITHUB_PUBLIC_REPO_TOKEN }}
        working-directory: ${{ steps.set-up-homebrew.outputs.repository-path }}
